mirror of
https://github.com/prometheus/prometheus.git
synced 2024-11-18 11:34:05 -08:00
131 lines
2.6 KiB
Go
131 lines
2.6 KiB
Go
// Copyright 2019 The Prometheus Authors
|
|
// Licensed under the Apache License, Version 2.0 (the "License");
|
|
// you may not use this file except in compliance with the License.
|
|
// You may obtain a copy of the License at
|
|
//
|
|
// http://www.apache.org/licenses/LICENSE-2.0
|
|
//
|
|
// Unless required by applicable law or agreed to in writing, software
|
|
// distributed under the License is distributed on an "AS IS" BASIS,
|
|
// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
|
|
// See the License for the specific language governing permissions and
|
|
// limitations under the License.
|
|
|
|
package logging
|
|
|
|
import (
|
|
"bytes"
|
|
"sync"
|
|
"time"
|
|
|
|
"github.com/go-kit/log"
|
|
"github.com/go-logfmt/logfmt"
|
|
)
|
|
|
|
const (
|
|
garbageCollectEvery = 10 * time.Second
|
|
expireEntriesAfter = 1 * time.Minute
|
|
maxEntries = 1024
|
|
)
|
|
|
|
type logfmtEncoder struct {
|
|
*logfmt.Encoder
|
|
buf bytes.Buffer
|
|
}
|
|
|
|
var logfmtEncoderPool = sync.Pool{
|
|
New: func() interface{} {
|
|
var enc logfmtEncoder
|
|
enc.Encoder = logfmt.NewEncoder(&enc.buf)
|
|
return &enc
|
|
},
|
|
}
|
|
|
|
// Deduper implement log.Logger, dedupes log lines.
|
|
type Deduper struct {
|
|
next log.Logger
|
|
repeat time.Duration
|
|
quit chan struct{}
|
|
mtx sync.RWMutex
|
|
seen map[string]time.Time
|
|
}
|
|
|
|
// Dedupe log lines to next, only repeating every repeat duration.
|
|
func Dedupe(next log.Logger, repeat time.Duration) *Deduper {
|
|
d := &Deduper{
|
|
next: next,
|
|
repeat: repeat,
|
|
quit: make(chan struct{}),
|
|
seen: map[string]time.Time{},
|
|
}
|
|
go d.run()
|
|
return d
|
|
}
|
|
|
|
// Stop the Deduper.
|
|
func (d *Deduper) Stop() {
|
|
close(d.quit)
|
|
}
|
|
|
|
func (d *Deduper) run() {
|
|
ticker := time.NewTicker(garbageCollectEvery)
|
|
defer ticker.Stop()
|
|
|
|
for {
|
|
select {
|
|
case <-ticker.C:
|
|
d.mtx.Lock()
|
|
now := time.Now()
|
|
for line, seen := range d.seen {
|
|
if now.Sub(seen) > expireEntriesAfter {
|
|
delete(d.seen, line)
|
|
}
|
|
}
|
|
d.mtx.Unlock()
|
|
case <-d.quit:
|
|
return
|
|
}
|
|
}
|
|
}
|
|
|
|
// Log implements log.Logger.
|
|
func (d *Deduper) Log(keyvals ...interface{}) error {
|
|
line, err := encode(keyvals...)
|
|
if err != nil {
|
|
return err
|
|
}
|
|
|
|
d.mtx.RLock()
|
|
last, ok := d.seen[line]
|
|
d.mtx.RUnlock()
|
|
|
|
if ok && time.Since(last) < d.repeat {
|
|
return nil
|
|
}
|
|
|
|
d.mtx.Lock()
|
|
if len(d.seen) < maxEntries {
|
|
d.seen[line] = time.Now()
|
|
}
|
|
d.mtx.Unlock()
|
|
|
|
return d.next.Log(keyvals...)
|
|
}
|
|
|
|
func encode(keyvals ...interface{}) (string, error) {
|
|
enc := logfmtEncoderPool.Get().(*logfmtEncoder)
|
|
enc.buf.Reset()
|
|
defer logfmtEncoderPool.Put(enc)
|
|
|
|
if err := enc.EncodeKeyvals(keyvals...); err != nil {
|
|
return "", err
|
|
}
|
|
|
|
// Add newline to the end of the buffer
|
|
if err := enc.EndRecord(); err != nil {
|
|
return "", err
|
|
}
|
|
|
|
return enc.buf.String(), nil
|
|
}
|